Cleaning Pennies With Taco Bell Sauce

Who hasn't been to Taco Bell, ordered up a couple tacos, went to the condiment station and loaded up on hot sauce. Only to find out a couple hours later that your stomach is wreaking havoc and the heartburn is out of this world. Do you want to know why? Well other than the fact that the food probably isn't the healthiest in the world, the hot sauce is actually strong enough to clean pennies. Yes, you heard that right, Taco Bell hot sauce can clean the muck and junk right off a penny.
Taco Bell hot sauce is made from the following ingredients: Water, Tomato Paste, Jalapeno Peppers, Vinegar, Salt, Spices, Dehydrated Onions, Xanthum Gum, Sodium Benzoate, and Natural Flavor. So I guess it's safe to say that the penny cleaning compound isn't water (although I'm sure that the water in some cities could do the job). So what is it?